C++ nsSubstring::Length方法代码示例

nsresult
txBufferingHandler::characters(const nsSubstring& aData, PRBool aDOE)
{
    NS_ENSURE_TRUE(mBuffer, NS_ERROR_OUT_OF_MEMORY);

    mCanAddAttribute = PR_FALSE;

    txOutputTransaction::txTransactionType type =
         aDOE ? txOutputTransaction::eCharacterNoOETransaction
              : txOutputTransaction::eCharacterTransaction;

    txOutputTransaction* transaction = mBuffer->getLastTransaction();
    if (transaction && transaction->mType == type) {
        mBuffer->mStringValue.Append(aData);
        static_cast<txCharacterTransaction*>(transaction)->mLength +=
            aData.Length();
        return NS_OK;
    }

    transaction = new txCharacterTransaction(type, aData.Length());
    NS_ENSURE_TRUE(transaction, NS_ERROR_OUT_OF_MEMORY);

    mBuffer->mStringValue.Append(aData);
    return mBuffer->addTransaction(transaction);
}

/**
 * Check for a modifier flag of the following form:
 *   "flag=string"
 *   "flag!=string"
 * @param aFlag The flag to compare.
 * @param aData The tokenized data to check; this is lowercased
 *              before being passed in.
 * @param aValue The value that is expected.
 * @param aResult If this is "ok" when passed in, this is left alone.
 *                Otherwise if the flag is found it is set to eBad or eOK.
 * @return Whether the flag was handled.
 */
static bool
CheckStringFlag(const nsSubstring& aFlag, const nsSubstring& aData,
                const nsSubstring& aValue, TriState& aResult)
{
  if (aData.Length() < aFlag.Length() + 1) {
    return false;
  }

  if (!StringBeginsWith(aData, aFlag)) {
    return false;
  }

  bool comparison = true;
  if (aData[aFlag.Length()] != '=') {
    if (aData[aFlag.Length()] == '!' &&
        aData.Length() >= aFlag.Length() + 2 &&
        aData[aFlag.Length() + 1] == '=') {
      comparison = false;
    } else {
      return false;
    }
  }

  if (aResult != eOK) {
    nsDependentSubstring testdata =
      Substring(aData, aFlag.Length() + (comparison ? 1 : 2));
    if (testdata.Equals(aValue)) {
      aResult = comparison ? eOK : eBad;
    } else {
      aResult = comparison ? eBad : eOK;
    }
  }

  return true;
}

void
mozInlineSpellWordUtil::NormalizeWord(nsSubstring& aWord)
{
  nsAutoString result;
  ::NormalizeWord(aWord, 0, aWord.Length(), result);
  aWord = result;
}

/**
 * Check for a modifier flag of the following forms:
 *   "flag"   (same as "true")
 *   "flag=yes|true|1"
 *   "flag="no|false|0"
 * @param aFlag The flag to compare.
 * @param aData The tokenized data to check; this is lowercased
 *              before being passed in.
 * @param aResult If the flag is found, the value is assigned here.
 * @return Whether the flag was handled.
 */
static bool
CheckFlag(const nsSubstring& aFlag, const nsSubstring& aData, bool& aResult)
{
  if (!StringBeginsWith(aData, aFlag)) {
    return false;
  }

  if (aFlag.Length() == aData.Length()) {
    // the data is simply "flag", which is the same as "flag=yes"
    aResult = true;
    return true;
  }

  if (aData.CharAt(aFlag.Length()) != '=') {
    // the data is "flag2=", which is not anything we care about
    return false;
  }

  if (aData.Length() == aFlag.Length() + 1) {
    aResult = false;
    return true;
  }

  switch (aData.CharAt(aFlag.Length() + 1)) {
    case '1':
    case 't': //true
    case 'y': //yes
      aResult = true;
      return true;

    case '0':
    case 'f': //false
    case 'n': //no
      aResult = false;
      return true;
  }

  return false;
}